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  <title>Usage: Events</title>
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<h2>Events</h2>
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  <td style="width: 30%;"><font color="DarkBlue">OnScroll</font></td>
  <td>Fired on horizontal or vertical scrolling.
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  <td><font color="DarkBlue">OnOptionsChange</font></td>
  <td>Fired after some option has been changed by user.<br>
    For example, image scale can be changed by (Left mouse button + Wheel) shortcut.
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  <td><font color="DarkBlue">OnAfterPaint</font></td>
  <td>Fired after image painting is done.<br>
    You can use this event to perform some custom painting on the image,
    e.g. draw lines, circles etc. Canvas and painting rectangle are passed as parameters.
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